Mixing-machine.



I. A. svENs-ON. MIXING MACHINE. APPLICATION FILED JUNE I4 ISI-I5- Patented Sept., 1I, w17,

2 SHEETS-SHEET I.

I. A. SVENSON.

MIXING MACHINE.

APPLICATION FILED JUNE I4, 1916.

Patented Sept. 11, 1917.

2 SHEETS-SHEET 2.v

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UNllPlllE STATE@ PAENT JOHN A. SVNSON, OF PITTSBURGH, PENNSYLVANIA, ASSlG-NOR OF ONE-HALF TO i JESSE J'. SHUMAN, OF PITTSBURGH, PENNSYLVANIA.

MIXING-Maestria.

Specication of Letters Patent.

)Patented Sept. 1 1, 1917.

Application filed June 14, 1916. Serial No. 103,606.

To all whom t may concern:

Be it known that I, JOHN A. Svmvsoma citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented cerw tain new and useful Improvements in Mixing-Machines, of which the following is a specification. 1

This invention relates to machines for mixing variousmaterials, as, for example, substances used in the production of concrete. The invention relates particularly to machines comprising a revoluble drum.`

The mixing drum must have large unobstructed end-openings for the entry and exit of the treated materials. This requirement has led to the common practice of rotatably mounting the drum upon rollers which support the drum on heavy rings or bands encircling the periphery of the drum, since this method of drum support left the drum ends free. However, various practical diil'iculties arise out of this manner of supporting the drum. Abrasive materials soon collect on the Contact surfaces of the rollers and bands and cause rapid and unequal wear at these points. 1n addition to the actual destructionof the parts, such wear results also in a change of the center of rotation, which fault is very detrimental, particularly when the-,drum is rotated by means of a pinion meshing with a toothed rim on the drum. The accuracy of this method of rotating the drum is destroyed as soon as the center of rotation has been changed.

The object of this invention, generally stated, is to avoid these difficulties and still provide for the entry and exit of the materials through the ends of the drum.

ln the accompanying drawings,l*`igure 1 is a vertical central sectional view through a mixing machine embodying the features of my invention. Fig. 2 is a fragmenta'l detail view of the discharging means. Fig. 3 is an elevation of the left-hand end of the machine as shown in Fig. 1. Fig. `4l isa plan view of a bracket comprised in the construction. Fig. 5 is an inner end elevation of the bracket.

rlhe supporting frame of themachine may be` of any suitable character. Herein is shown a frame comprising' two horizontal beams 1 and a pair of uprights 3 and 4t secured to said beams, respectively. Rigidly secured to the uprights 3 and 4 are 4two horizontal inwardly-extending brackets 5. One of these brackets is shown in plan and in end view in Figs. 1l and 5. As there indicated, the bracket 5 is of` U-form and comprises a pair of parallel arms G arranged to be secured at their outer ends to the uprights hereinbefore mentioned, the inner ends of said arms being joined by a transverse portion 7. Upon the transverse portion 7 is an inwardly extending socket or sleeve S. The sockets 8 of the brackets 5 are axially alined and contain the ends of a stationary shaft 9. Said shaft is rigidly secured to the brackets 5 by means of screws 10 extending through the transverse portion l and into the ends of the shaft. The shaft 9 and screws 10 serve to secure the brackets 5 rigidly together and thus unite the uprights 8 and 4 and give stability to the framework.

Upon the shaft 9 is rotatably mounted a sleeve 11 extending from one bracket 5 to the other. To prevent gritty materials from reaching the contacting surfaces of the shaft 9 and sleeve 11, the endsvllL of the sleeve are extended to telescope with and contain the sockets S of the brackets 5, clearance being provided between the periphery of said sockets and the interior of the ends 11a. l further provide upon each portion 'l a shield 12 which overlies the adjacent sleeveend 11a. The shieldl extends over the top of the sleeve-end 11nl and vertically along the sides of said sleeve-end, the lower side or end of the shield being open to permit the escape of any gritty materials that mayy enterthe shield through the space between the upper portion of the shield and the upper portion of the sleeve-end 11a.

The drum 13 has end walls 13a, each end wall having a central opening of ample size for the entrance and egress of the .materials operated upon. The drum is rigidly secured to the sleeve 11 by means of a plurality of spokes or tie-rods 14, each secured at oneend to the sleeve 11 and at its opposite lend to the peripheral wall of the drum. The

. form of these rods and their number and relative position may be other than as herein shown, but the illustrated construction is preferred. It will be noted that the rods 14 extend in an inclined position and that adjacent rods are oppositely inclined. This staggered arrangement of the rods gives to the drum the requisite stability in operation. The rods may be inserted from the outside through openings 15 in the drum. The inner endso'f'the rods are threaded 'for insertion into screw-threaded openings in the sleeve 11. are secured to the drum by means of beveled Washers 16 and nuts 17. The nuts 17 pro- Vide convenient means for accurately locating the sleeve 11 in the axis lofthe drum 1:3.-

kAnysuitable means may be provided for charging the' drum. `Herein `is shown a spout g1'8 secured-tothe uprights 4, the lower endcof vthe drum Aextending within the central Aopening 19in 'one end wall 13 of the drinn 13;`

Any preferred Imeans may beL provided within the drum 13 A'to assist in mixing the materials to be treatedand lto= advance 'and elevate' said materials; Herein I h'afe" shown-1an annular series of 'spirally-placed blades 20 secured to the inner vperiphery of the fdrum 18 in position to yelevate and; advance fthe materials entering through the spout 18. There is alsoshown an annular series of buckets 21 fixed to the linner eriphery of the drum in position tocelevate'jthe materials advanced by' :the lblades 20. 22 isa lplate secured "to -the transverse portion 7 of the bracket -5 whiclris located at the discharge end of the drum, said plate being inclined `downwardly Itoward the charging end of the drum.v As shownr in Fig; 1,-the` plate '22 *is located in the plane of 'the orbit fof lthe buckets 21 and" within said/@rhin Materials falling -on said plate are directed' out vof the-orbit of the buckets andv toward thecliarging end of lthe drum.

VV'hile any suitable ymeans may be 'employed to discharge the mixed materials, the means lpreferably employed comprises a chu-te 23 fixed tothe 'uprifglits 3 and: extending tl-irouglr a centralopening 24 in the adjacent end of the drum. The chu-te Q3A occupies an inclined position, its upper inner end being sufficiently far within the drum so that materia-ls dischaaged from the ascending buckets 21 willlbe 'received inthe chute. The chiite is provided at its upper end with a movable bottom section 25 which is` fixed to Ian? arm 26' attached 'to` a rocksha'ft 2%, said rock-shaft being journafled -in the' sidewalls of the chute 23; "llo thelower side -of 'the bottom Q5 is pivotedA a link '2S which serves tol connect said Ibottom with `a crank :arm 29 fixed upon a rock-shaft 30. Said `shaft is mounted in the uprights- 3A and is .provided with an operating crank "31.

-Dfuring the mixing of the materials the' bottom 25 occupies the positionl shown in dotted lines inFifg. 1. AThe materials -spilled from the buckets 21 strike the bottom E25l and slide ontoL the plate 22; `the latter detlec'ts thev materials toward the charging l'endl of th'edri`1m.f, where they undergo further agitation.

The outer ends of the rods 'tion s'hown'in ffiill linesin'lFig. 1, thus placing the bottom 25 in position to direct the mixed materials discharged by the ascend- -ingbucket 21, out through the chute 23.

The means for lubricating the 'bearing for theslee've11coniprises an oil cup 32 supported upon a tube 33 extending through the charging spout'18anclY coinmiinicating with a 'chamber B4 -i'n the central port-ion fof the pfart `7 'of fthe bracket f5/connected tothe up'rightsi. the adj acentfendj offthe shafft 9 is' an-o'il duct 35 communicating Withthe chamber andl with 'the lower surface of the'shaftQatBGl Any suitable form of drum-rotating mean-smaymc employed- Hereinlis 'shown ay toothed ring 3'7 xednponithelpeniphery of the `drum 4and arranged to'ime'sh 'ivith a diiving'pinion (inolt'shown-)t c It rwill be :seen that 'the drum '13y is supported at i't-s :axis rather than kat its periphery, yandfthat thiefhas` lbeen accomplished without material-ly obstructin'g'the charging andidischargingopenings the ends -o'f the drum. rThe bearings-that sup'p o'rt `thedri'ifm areene et-'w'fely protected aga-inst fthe entrance of "grit andl thus are protected against excessive wear, besides" insuring' Vper'inanenc'e in the relation Aof the center-of rotation toV Ethe driving pinion; A' i It will be notedj "that the brackets are alike in size and form, which 'fea-ture 'contributes :to economy rin construction;

l Acla-im as 'my linventi'onr' l. A lbatc'li mi'i'iing'machine having, vin combination", -a supporting framework, a sta'- tionary lul-shape lbrack'et, ythe ends of the arms iof which are rigidly -fixedto lsaid framework, *a shaft :fixed at one end tofthe closed endlof said bracket, means att-ached jto the supporting framework for ksLip-porting the other end of the shaft, mix-ing drum haarili'i'g end 'walls to' retain the material therein, each 'end u'l-l having a contrai opening, said bracket extending through the opening *in v'one end; wall Vof the drum, the closedy end of the bracket bein-gjwifthin the drum, means for rotatably v'supfporting the dr'unr on said shaft, and inlet spout statioiiari-ly located in position to" project into theopening in the" last mentioned' end wall of the drum and di'scharge materialfthrough the space between the aTms of said bracket. "2. ,A batch mixing machine having, in combination, 'al supporting framework, two stationary brackets rigid ly fixed to said framework,said brackets extending" toward each iother, a mixingdrum having :end walls to retain the material therein, A'each endy wall having a central opening, said brackets yex*- tending thfrougl'i the openin'gs` in `the end acl walls of the charm, tli-'e inner ends of the 1'3l0 brackets being within the drum, means connected to the drum and supported by the inner ends 0f said brackets for rotatably supporting the drum, means for charging material into the drum through the central opening in one end wall of the drum, and means for discharging material through the central opening in the other end wall of the drum.

3. A batch mixing machine having, in combination, a supporting framework, a stationary U-shaped bracket rigidly xed to said framework, a mixing drum having end walls to retain the material therein each end wall having a central opening, said bracket extending through the opening in one of the end walls of the drum, the closed ends of the bracket being within the drum, a support fixed to the framework opposite said bracket, means connected to the drum and supported by the inner end of said bracket and by said support for rotatably supporting the drum, a discharge chute extending through the central opening of one end wall of the drum and extending from a point within the drum to a point outside the drum, said chute extending through the space between the arms of the U-shaped bracket, and elevating devices within the drum for discharging material onto said chute.

t. A mixing machine having, in combination, a rotatably mounted drum having end walls, one end wall having a central charging opening and the other end wall having a central discharging opening, elevating buckets attached to the inner side of the peripheral wall of the drum near the disn charging end of the drum, means located within the orbit of the buckets and in the plane of the buckets for directing materials falling upon it out of the orbit of the buckets toward the charging end of the drum, a discharge chute extending through the discharging opening, said chute including a member movable into and out of position to intercept materials which otherwise would fall upon said directing means, and an inclined member stationarily located within the drum and below the movable chute member for directing falling materials toward the charging-end of the drum.

In testimony whereof, I have hereunto set my hand.

JOHN A. SVENSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of' Patents, Washington, D. C. 

